1.nf
2                                                           +- Digit 0 0 | 1
3                                                           |            |
4                               +- Term 0 2 --- Number 0 2 -+- Digit 1 1 | 2
5                               |                           |            |
6                               |                           +- Digit 2 2 | 0
7                               |                                        |
8Expression 0 4 --- Factor 0 4 -+----------------------------- AddOp 3 3 | +
9                               |                                        |
10                               +- Term 4 4 --- Number 4 4 --- Digit 4 4 | 5
11.fi
12